/*
 * net/sched/em_cmp.c	Simple packet data comparison ematch
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 *
 * Authors:	Thomas Graf <tgraf@suug.ch>
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/tc_ematch/tc_em_cmp.h>
#include <asm/unaligned.h>
#include <net/pkt_cls.h>

static inline int cmp_needs_transformation(struct tcf_em_cmp *cmp)
{
	return unlikely(cmp->flags & TCF_EM_CMP_TRANS);
}

static int em_cmp_match(struct sk_buff *skb, struct tcf_ematch *em,
			struct tcf_pkt_info *info)
{
	struct tcf_em_cmp *cmp = (struct tcf_em_cmp *) em->data;
	unsigned char *ptr = tcf_get_base_ptr(skb, cmp->layer) + cmp->off;
	u32 val = 0;

	if (!tcf_valid_offset(skb, ptr, cmp->align))
		return 0;

	switch (cmp->align) {
	case TCF_EM_ALIGN_U8:
		val = *ptr;
		break;

	case TCF_EM_ALIGN_U16:
		val = get_unaligned_be16(ptr);

		if (cmp_needs_transformation(cmp))
			val = be16_to_cpu(val);
		break;

	case TCF_EM_ALIGN_U32:
		/* Worth checking boundries? The branching seems
		 * to get worse. Visit again.
		 */
		val = get_unaligned_be32(ptr);

		if (cmp_needs_transformation(cmp))
			val = be32_to_cpu(val);
		break;

	default:
		return 0;
	}

	if (cmp->mask)
		val &= cmp->mask;

	switch (cmp->opnd) {
	case TCF_EM_OPND_EQ:
		return val == cmp->val;
	case TCF_EM_OPND_LT:
		return val < cmp->val;
	case TCF_EM_OPND_GT:
		return val > cmp->val;
	}

	return 0;
}

static struct tcf_ematch_ops em_cmp_ops = {
	.kind	  = TCF_EM_CMP,
	.datalen  = sizeof(struct tcf_em_cmp),
	.match	  = em_cmp_match,
	.owner	  = THIS_MODULE,
	.link	  = LIST_HEAD_INIT(em_cmp_ops.link)
};

static int __init init_em_cmp(void)
{
	return tcf_em_register(&em_cmp_ops);
}

static void __exit exit_em_cmp(void)
{
	tcf_em_unregister(&em_cmp_ops);
}

MODULE_LICENSE("GPL");

module_init(init_em_cmp);
module_exit(exit_em_cmp);

MODULE_ALIAS_TCF_EMATCH(TCF_EM_CMP);
/'>
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<tr><th>author</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2016-06-25 06:55:48 -0700</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2016-06-25 06:55:48 -0700</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=ca83a55c9fe20b45a26101853a772e08aff90dcb'>ca83a55c9fe20b45a26101853a772e08aff90dcb</a> (<a href='/cgit.cgi/linux/net-next.git/patch/?id=ca83a55c9fe20b45a26101853a772e08aff90dcb'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=ca83a55c9fe20b45a26101853a772e08aff90dcb'>aa597c32d9a4062616cfdf38abb668c1758fc843</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=9a949a98596c45763299158b9018f3491e3cbf99'>9a949a98596c45763299158b9018f3491e3cbf99</a> (<a href='/cgit.cgi/linux/net-next.git/diff/?id=ca83a55c9fe20b45a26101853a772e08aff90dcb&amp;id2=9a949a98596c45763299158b9018f3491e3cbf99'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=d5dbbe6569481bf12dcbe3e12cff72c5f78d272c'>d5dbbe6569481bf12dcbe3e12cff72c5f78d272c</a> (<a href='/cgit.cgi/linux/net-next.git/diff/?id=ca83a55c9fe20b45a26101853a772e08aff90dcb&amp;id2=d5dbbe6569481bf12dcbe3e12cff72c5f78d272c'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge tag 'sound-4.7-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound</div><div class='commit-msg'>Pull sound fixes from Takashi Iwai:
 "Again pretty calm weeks: we've had only a few trivial / stable
  HD-audio fixes in addition to a possible race fix for snd-dummy driver
  spotted by syzkaller"

* tag 'sound-4.7-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
  ALSA: dummy: Fix a use-after-free at closing
  ALSA: hda / realtek - add two more Thinkpad IDs (5050,5053) for tpt460 fixup
  ALSA: hda - Fix the headset mic jack detection on Dell machine
  ALSA: hda/tegra: iomem fixups for sparse warnings
  ALSA: hdac_regmap - fix the register access for runtime PM
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=ca83a55c9fe20b45a26101853a772e08aff90dcb'>Diffstat</a></div><table summary='diffstat' class='diffstat'>